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<title>Canvas test: 2d.composite.globalAlpha.invalid</title>
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<script src="../tests.js"></script>
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<body class="framed show_output">
<h1>
<a href="2d.composite.globalAlpha.invalid.html" target="_parent">2d.&#8203;composite.&#8203;globalAlpha.&#8203;invalid</a>
</h1>
<p><a href="#" id="show_output" onclick="document.body.className += ' show_output'; return false">[show output]</a>
<p class="output">Actual output:</p>
<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>

<ul id="d"></ul>
<script>
_addTest(function(canvas, ctx) {

ctx.globalAlpha = 0.5;
var a = ctx.globalAlpha; // might not be exactly 0.5, if it is rounded/quantised, so remember for future comparisons
try { var _thrown = false;
  ctx.globalAlpha = Infinity;
} catch (e) { if (e.code != DOMException.NOT_SUPPORTED_ERR) _fail("Failed assertion: expected exception of type NOT_SUPPORTED_ERR, got: "+e.message); _thrown = true; } finally { _assert(_thrown, "should throw exception of type NOT_SUPPORTED_ERR: ctx.globalAlpha = Infinity"); }
_assertEqual(ctx.globalAlpha, a, "ctx.globalAlpha", "a");
try { var _thrown = false;
  ctx.globalAlpha = -Infinity;
} catch (e) { if (e.code != DOMException.NOT_SUPPORTED_ERR) _fail("Failed assertion: expected exception of type NOT_SUPPORTED_ERR, got: "+e.message); _thrown = true; } finally { _assert(_thrown, "should throw exception of type NOT_SUPPORTED_ERR: ctx.globalAlpha = -Infinity"); }
_assertEqual(ctx.globalAlpha, a, "ctx.globalAlpha", "a");
try { var _thrown = false;
  ctx.globalAlpha = NaN;
} catch (e) { if (e.code != DOMException.NOT_SUPPORTED_ERR) _fail("Failed assertion: expected exception of type NOT_SUPPORTED_ERR, got: "+e.message); _thrown = true; } finally { _assert(_thrown, "should throw exception of type NOT_SUPPORTED_ERR: ctx.globalAlpha = NaN"); }
_assertEqual(ctx.globalAlpha, a, "ctx.globalAlpha", "a");


});
</script>

